Changing functions based on checkbox being checked or not

I have the same function checking 2 different text input fields in a form. If a checkbox is checked, I need the function to run on one of the text input fields. If the checkbox is not checked, I need the function to run on the other text input field.

Here is the checkbox:

<input id="use_different_addresses" type="checkbox" value="1" name="use_different_addresses" />Use different address<br />

By default the checkbox is not checked. When unchecked, I need this function to run:

$('#customer_country_name').change(function() {
    if ($('#customer_country_name').val() != 'United States') {
        $('.radio_us').hide();
    }
    else {
        $('.radio_us').show();
开发者_Go百科    }
});

When the checkbox is checked, I need this function to run:

$('#shipping_country_name').change(function() {
    if ($('#customer_country_name').val() != 'United States') {
        $('.radio_us').hide();
    }
    else {
        $('.radio_us').show();
    }
});

Thanks!

Why not just add a check to the top of each method to determine if it should run or not based on the checked state

$('#customer_country_name').change(function() {
  if (!$('#use_different_addresses').is(':checked')) {
   ...
  }
}

$('#shipping_country_name').change(function() {
  if ($('#use_different_addresses').is(':checked')) {
   ...
  }
}

EDIT

OP clarified in comments that they wanted certain radio boxes to be hidden when the check-box was checked. Here's the solution I recomended

$('#use_different_addresses').change(function() {
  if ($('#use_different_addresses').is(':checked')) {
    $('.radio_us').hide();
  } else {
    $('.radio_us').show();
  }
});

Without seeing more markup, you can use .toggle() to trigger the .change()

$("#use_different_addresses").toggle(function(){
  $('#customer_country_name').change();
}, function(){
  $('#shipping_country_name').change();
});

Finally got it to work here:

http://jsfiddle.net/4UkTP/

It's probably not the prettiest jQuery (I'll admit I'm a newbie), but it works! :)